Bash snippet to require bash version >= 4

version-check.sh

#!/usr/bin/env bash

if [[ $BASH_VERSION == [0123].* ]]; then
    >&2 printf "\033[0;31mThe %s script requires bash >= v4 (released february 2009)\033[0m\n" "$0"
    >&2 echo "You are using bash $BASH_VERSION"
    if [[ "$(uname -s)" == Darwin* ]]; then
        >&2 echo "macOS is known to include a particularly ancient version of bash due to licensing shenanigans."
        >&2 printf "You can use homebrew to update it yourself: \033[1;36mbrew install bash \033[0m\n"
    fi
    exit 1
fi